Added slicing operation to DVector via DVector.subarray(int start,int end) method.

Negative indices index from the end of the array.
Indices are range checked before attempting and return appropriate error when out of range.
Binding for RawArray in gdscript to access DVector.subarray() provided.
Documentation of RawArray.subarray() in classes.xml provided.

2 files changed, 30 insertions, 0 deletions

diff --git a/core/dvector.h b/core/dvector.h
index a5519ed604..9a54641617 100644
--- a/core/dvector.h
+++ b/core/dvector.h
@@ -262,6 +262,34 @@ public:
 			w[bs+i]=r[i];
 	}
 
+	DVector<T> subarray(int p_from, int p_to) {
+
+		if (p_from<0) {
+			p_from=size()+p_from;
+		}
+		if (p_to<0) {
+			p_to=size()+p_to;
+		}
+		if (p_from<0 || p_from>=size()) {
+			DVector<T>& aux=*((DVector<T>*)0); // nullreturn
+			ERR_FAIL_COND_V(p_from<0 || p_from>=size(),aux)
+		}
+		if (p_to<0 || p_to>=size()) {
+			DVector<T>& aux=*((DVector<T>*)0); // nullreturn
+			ERR_FAIL_COND_V(p_to<0 || p_to>=size(),aux)
+		}
+
+		DVector<T> slice;
+		int span=1 + p_to - p_from;
+		slice.resize(span);
+		Read r = read();
+		Write w = slice.write();
+		for (int i=0; i<span; ++i) {
+			w[i] = r[p_from+i];
+		}
+
+		return slice;
+	}
 
 	Error insert(int p_pos,const T& p_val) {
 
diff --git a/core/variant_call.cpp b/core/variant_call.cpp
index 7da4cef115..8c11007a53 100644
--- a/core/variant_call.cpp
+++ b/core/variant_call.cpp
@@ -517,6 +517,7 @@ static void _call_##m_type##_##m_method(Variant& r_ret,Variant& p_self,const Var
 	VCALL_LOCALMEM1(ByteArray,append);
 	VCALL_LOCALMEM1(ByteArray,append_array);
 	VCALL_LOCALMEM0(ByteArray,invert);
+	VCALL_LOCALMEM2R(ByteArray,subarray);
 
 	VCALL_LOCALMEM0R(IntArray,size);
 	VCALL_LOCALMEM2(IntArray,set);
@@ -1532,6 +1533,7 @@ _VariantCall::addfunc(Variant::m_vtype,Variant::m_ret,_SCS(#m_method),VCALL(m_cl
 	ADDFUNC2(RAW_ARRAY,INT,ByteArray,insert,INT,"idx",INT,"byte",varray());
 	ADDFUNC1(RAW_ARRAY,NIL,ByteArray,resize,INT,"idx",varray());
 	ADDFUNC0(RAW_ARRAY,NIL,ByteArray,invert,varray());
+	ADDFUNC2(RAW_ARRAY,RAW_ARRAY,ByteArray,subarray,INT,"from",INT,"to",varray());
 
 	ADDFUNC0(RAW_ARRAY,STRING,ByteArray,get_string_from_ascii,varray());
 	ADDFUNC0(RAW_ARRAY,STRING,ByteArray,get_string_from_utf8,varray());